Tablet view: shrink tree width 25%, remove history panel

Tree column reduced from 300px to 225px. Removed the ChangeLog
ListBox and its row splitter from the tablet layout since they
are not needed on Android.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: sharpninja

src/RequestTracker.Android/Views/TabletMainView.axaml

@@ -19,7 +19,7 @@
         <conv:FileNodeToArchiveVisibleConverter x:Key="FileNodeToArchiveVisible"/>
     </UserControl.Resources>
 
-    <Grid x:Name="MainGrid" ColumnDefinitions="300, 4, *" RowDefinitions="*, 4, 150, Auto">
+    <Grid x:Name="MainGrid" ColumnDefinitions="225, 4, *" RowDefinitions="*, Auto">
         <!-- Tree View -->
         <TreeView Grid.Column="0" Grid.Row="0"
                   ItemsSource="{Binding Nodes}" SelectedItem="{Binding SelectedNode}"
@@ -49,19 +49,11 @@
             </TreeView.ItemContainerTheme>
         </TreeView>
 
-        <!-- Splitter 1 -->
-        <GridSplitter Grid.Column="0" Grid.Row="1" ResizeDirection="Rows" Background="LightGray"/>
-
-        <!-- History Panel -->
-        <Border Grid.Column="0" Grid.Row="2" BorderBrush="Gray" BorderThickness="0,1,0,0">
-            <ListBox ItemsSource="{Binding ChangeLog}" Background="Transparent"/>
-        </Border>
-
-        <!-- Splitter 2 -->
-        <GridSplitter Grid.Column="1" Grid.Row="0" Grid.RowSpan="3" ResizeDirection="Columns" Background="LightGray"/>
+        <!-- Column Splitter -->
+        <GridSplitter Grid.Column="1" Grid.Row="0" ResizeDirection="Columns" Background="LightGray"/>
 
         <!-- Viewer Panel (no chat button for Android) -->
-        <Grid Grid.Column="2" Grid.Row="0" Grid.RowSpan="3" RowDefinitions="Auto, *">
+        <Grid Grid.Column="2" Grid.Row="0" RowDefinitions="Auto, *">
              <!-- Navigation Toolbar -->
              <Grid Grid.Row="0" ColumnDefinitions="Auto, Auto, Auto, *" Margin="5">
                 <Button Grid.Column="0" Command="{Binding NavigateBackCommand}" Margin="0,0,5,0" Width="30" ToolTip.Tip="Back">
@@ -199,7 +191,7 @@
         </Grid>
 
         <!-- Status Bar -->
-        <Border Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="3" Padding="8,6">
+        <Border Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3" Padding="8,6">
             <Grid ColumnDefinitions="*,Auto">
                 <SelectableTextBlock Grid.Column="0" Text="{Binding StatusMessage}" FontWeight="Bold" VerticalAlignment="Center"/>
                 <TextBlock Grid.Column="1" Text="{Binding AppVersionDisplay}" VerticalAlignment="Center" Foreground="Gray"/>